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Most people are happy to give their neighbours a spare house key in case of emergencies, but you probably wouldn’t want to give them your digital passwords. Now security researchers have shown that you may not have a choice, at least when it comes to cloud computing.

Cloud servers let users run simulations of an ordinary computer, called virtual machines (VMs), on remote hardware. A VM performs exactly as an ordinary computer would, but because it is entirely software-based, many of them can run on a single hardware base. Yinqian Zhang of the University of North Carolina, Chapel Hill, and colleagues have discovered that it is possible for one VM to steal cryptographic keys – used to keep your data secure – from another running on the same physical hardware, potentially putting cloud-computing users at risk.

The attack exploits the fact that both VMs share the same hardware cache, a memory component that stores data for use by the computer’s processor. The attacking VM fills the cache in such a way that the target VM, which is processing a cryptographic key, is likely to overwrite some of the attacker’s data. By looking at which parts of the cache are changed, the attacking VM can learn something about the key in use.

Zhang and team did not test the attack in the cloud for real, but used hardware similar to that employed by Amazon’s cloud service to try stealing a decryption key. They were able to reconstruct a 4096-bit key in just a few hours, as reported in a paper presented at the Computer and Communications Security conference in Raleigh, North Carolina, last month.

This attack won’t apply in all situations, as an attacker would have to establish a VM on the same hardware as yours, which isn’t always possible. What’s more, an attack would not work on hardware running more than two VMs. Still, those looking to use cloud services for high-security applications may want to reconsider.

Reuters first broke the news last night after obtaining an internal memo and Groupon has since confirmed Brown’s departure.

The memo was written by Groupon’s head of operations, Kal Raman.

Raj Ruparell, head of Groupon Goods, will be taking over Brown’s position.

Brown joined Groupon in 2010 from Yahoo and formed Groupon’s first national sales division. The memo did not say where Brown is headed next, but AllThingsD says his leaving may be Raman’s doing. Raman was recently appointed to his SVP role and is reportedly “cleaning house.”

Brown is the second top sales executive to depart Groupon this week. Jayna Cooke’s departure was made known three days ago; she was one of the company’s top salespeople who led the charge on major corporate accounts like Gap.

“Under Lee’s management, the team has secured a number of key customers, and I’d like to personally thank Lee for his contributions and wish him the best in his next opportunity,” Raman wrote.

Despite all Netflix’s misgivings up until early this year, the service has got its users watching more video than ever. CEO Reed Hastings recently took to Facebook to announce that subscribers have watched over one billion hours of content in a single month, for the “first time ever.” As Tech Crunch points out, that’s about one hour of video-viewing per day against the five hours that the regular ole tube garners. Hastings also mentioned he’s excited about the service’s exclusive rights to House of Cards and Arrested Development, declaring that they’ll help to “blow these records away.” If you’ll recall, back in January the company claimed 26 million streaming subscribers worldwide, compared to just over 10 million who opted for discs — it’ll be very interesting to see how these fluctuate given its newer takes on content.

But it didn’t even show up in the Ace Metrix Top 10. Ace Metrix measures a panel of 500 consumers who watch ads and rate them for effectiveness. That research says Doritos’ sling baby ad won the night.

It was also a big night for dogs. Volkswagen’s much anticipated follow-up to its little Darth Vader spot from last year used an obese dog getting in shape to gets its revenge on a VW it wanted to chase down the street (and then somehow ended up in the Star Wars cantina scene).

Whether you’re looking for a way to catch the big game this weekend when you’re away from your living room, or you just like to catch live television when you’re trapped somewhere without either cable or a television, you have plenty of options to help you catch a broadcast on your mobile phone or your computer. Here’s a look at five of the best ways to tune in when you’re on the go.

Earlier in the week we asked how you tune into live television that you’re subscribed to on your mobile device or when you’re not in front of the big screen. You responded, and now we’re back to take a look at the top five, based on your nominations.

When you need to stream audio or video around the house, to your mobile device, or across the globe when you’re away from home, Orb can certainly deliver. We mentioned Orb several times, and it’s still a great way to stream your media from your computer to other devices in your home, or, if you’re willing to pay for an Orb appliance to connect to your cable box or HTPC, stream live TV or recorded TV to any other device on or off of your home network. Orb supports video up to 720p, and gives you the flexibility to watch live sports, prime time TV shows, or anything else that’s currently airing in your living room on your mobile phone, tablet, or laptop over Wi-Fi, 3G, or 4G when you can’t be in the living room to enjoy it. Pricing varies depending on whether you need hardware (between $79-$99 for the set-top box) to connect to your TV and home network, or you already have a TV tuner in your HTPC (the Orb Live and Orb Caster software are both free, but the mobile apps are $9.99.)

Where other live TV streaming solutions offer complexity, Slingbox offers elegant simplicity. The Slingbox from Sling Media is a set-top box that connects to your TV and your cable or satellite receiver that makes it easy for you to effectively log in to your TV at home and watch live TV on your computer or mobile device as though you were sitting in front of your TV. You can change channels, browse TV listings, and even set your home DVR to record TV that you won’t make it home in time to watch. The Slingbox comes in two flavors, the Slingbox Solo and the Slingbox Pro-HD (which predictably supports HD and additional devices connected to it) and will set you back $179.99 to $299.99 (not including extended support options). You’ll also need to drop $29.99 for the SlingPlayer app to control your Slingbox from your smartphone or tablet, but the price buys you one of the most feature-rich and hassle-free live TV streaming solutions on the market.

Elgato’s EyeTV line of TV tuners and live TV software were, for a long time, the only option for Mac users who were looking for an easy way to use their Macs as TV tuners or HTPCs. They’re not the only options anymore, but they’re certainly one of the best, and if you plug a TV source in to an EyeTV and then the EyeTV into your Mac via USB, you want watch live TV right there on your computer screen. Combine an EyeTV tuner or DVR with the EyeTV app on your mobile device, and you can stream live or pre-recorded TV on your mobile device when you’re out of the house. The EyeTV app will set you back $4.99 in the iTunes App Store for any iOS device, and the tuners vary in price from $99 to $199 depending on whether you need a DTV tuner, a DTV and HD tuner, a tuner with a DVR inside, or a Wi-Fi enabled tuner that can wirelessly stream TV to other devices in your home.

The Vulkano Flow may not be one of the most well known set-top tuners on the market, but it’s definitely one of the most powerful. For $99.99, the Vulkano Flow is an easy to install and set up device that connects to your cable or satellite tuner, supports HD video, and your home network to allow you to wirelessly watch live TV on your iOS or Android device on your home network or when you’re away via 3G or 4G. You get complete control over your home TV, so you can switch channels, browse a built-in programming guide (that you don’t have to pay extra to view), and even connect to other video inputs like a DVR or HTPC and control that as well. Vulkano offers desktop players for Mac OS and Windows (Free), and mobile players for iOS, Android, and BlackBerry ($12.99.)

Hauppage is an old name in TV tuners, and the company is still going strong by offering a range of products to HTPC enthusiasts who want to build their own devices to stream, save, and watch live and recorded television and to people who would rather buy a set-top box to handle the streaming for them. Those of you who nominated the WinTV mentioned that you can easily install a WinTV tuner in your HTPC and download the WinTV application on your HTPC and iOS or Android device to stream TV from your HTPC to your device. Pricing varies depending on which tuner you’d like, whether you want HD video, and whether you want an internal or USB tuner to install at all or you’d just prefer a set-top box like the Hauppage Broadway ($199), but the WinTV Extend app you’ll need to stream from your Tuner will set you back $9.95, and the mobile apps are free (although they only support Wi-Fi.)

Now that you’ve seen the top five, it’s time to put them to an all out vote for the winner.

Honorable mentions this week go out to streaming TV sites like Justin.tv, which many of you said you use to stream your own TV shows to the web so you can catch them when you’re away from home, and to The NFL’s website, which many of you noted is indeed streaming the big game on their own. Finally, since we mentioned that the Department of Homeland Security had shut down FirstRowSports‘ primary domain, many of you made note of the fact that the site is still up and running on a different URL.

Have a favorite method that didn’t get the nominations needed to make the top five? Want to make a case for it, or for your favorite of the nominees above? Sound off in the comments below.

President Obama may have been on Google+ since November, but the administration is now stepping up its presence on the social network even further in anticipation of next week’s State of the Union address and the forthcoming presidential campaign. It now has an official White House Google+ page, where it plans to post the usual news, photos and videos, and also host regular Hangout video chats. There’s no promises yet that the President himself will take part, but the White House says it will regularly have administration officials and policy experts take part in the conversations, which will also be streamed on YouTube and WhiteHouse.gov. Those interested can click the link below to add the page to their Circles.

President Obama may have been on Google+ since November, but the administration is now stepping up its presence on the social network even further in anticipation of next week’s State of the Union address and the forthcoming presidential campaign. It now has an official White House Google+ page, where it plans to post the usual news, photos and videos, and also host regular Hangout video chats. There’s no promises yet that the President himself will take part, but the White House says it will regularly have administration officials and policy experts take part in the conversations, which will also be streamed on YouTube and WhiteHouse.gov. Those interested can click the link below to add the page to their Circles.

I have heard from the critics and I take seriously their concerns regarding proposed legislation to address the problem of online piracy. It is clear that we need to revisit the approach on how best to address the problem of foreign thieves that steal and sell American inventions and products.

The Committee will continue work with copyright owners, Internet companies, financial institutions to develop proposals that combat online piracy and protect America’s intellectual property. We welcome input from all organizations and individuals who have an honest difference of opinion about how best to address this widespread problem. The Committee remains committed to finding a solution to the problem of online piracy that protects American intellectual property and innovation.

We’re hesitant to say the bill is “dead”, but after the events of this week it’s unlikely we’ll see SOPA and PIPA come to a vote in their current form. This probably isn’t the last we’ve seen of anti-piracy legislation, of course, and future bills could be just as dangerous. There are still things you can do to help, and while this is a victory, it isn’t a permanent one, so we wouldn’t get too comfortable just yet. Hit the link to read more.

See? Congress does listen to the will of the people on occasion—especially when that will is wielded as a blunt instrument. As this infographic from ProPublica illustrates, yesterday’s blackout protests not only culled the official SOPA supporters by 15 congressmen, it actually added 70 opponents.

In all, official supporters for the House’s anti-piracy bill dropped from 80 members to 65 over Wednesday night, while the bill’s opponents swelled from just 30 members to 101 with another 41 polling as “leaning no.” Granted the “leaning no” crowd hasn’t ruled out voting for an amended version of the bill at a later date, doubling opposition to the bill overnight is a promising start. It’s amazing what 24 hours without Wikipedia will do. [Propublica]

Digital Consigliere

Dr. Augustine Fou is Digital Consigliere to marketing executives, advising them on digital strategy and Unified Marketing(tm). Dr Fou has over 17 years of in-the-trenches, hands-on experience, which enables him to provide objective, in-depth assessments of their current marketing programs and recommendations for improving business impact and ROI using digital insights.